St. Louis-based Ameren Corp. serves approximately 2.4 million electric customers and 900,000 natural gas customers through its Ameren Missouri and Ameren Illinois rate-regulated subsidiaries. Ameren Missouri provides vertically integrated electric service, with generating capacity of 10,200 megawatts, and natural gas delivery service. Ameren Illinois provides electric delivery and transmission service as well as natural gas delivery service. Ameren Transmission Co. of Illinois develops regional electric transmission projects, with most construction activity currently taking place in Illinois. In 2019, the company generated 47% of its electricity from coal, 26% from its Callaway nuclear plant, 4% from hydro sources, 1% from gas, and 22% from outside purchases.
Gary F. HovisVice President & Director of Utility Research Utilities (Electric)